Automatic production device for mobile phone charger bottom shell

Abstract

This invention discloses an automatic production device for mobile phone charger bottom shells, relating to the field of automatic production of charger bottom shells. The device includes a retaining splicing frame comprising a brake pad, a horizontal sliding groove frame, an extrusion plate frame, an electric sliding groove, a vertical connecting frame, and a square clamping block. The brake pad is movably connected to the outer circumferential surface of a spiral rod, and a movable key is provided on the inner wall of the brake pad, located in a spiral groove on the outer circumferential surface of the spiral rod. The extrusion plate frame is slidably connected to the outer wall of the horizontal sliding groove frame, the vertical connecting frame is slidably connected to the inner wall of the electric sliding groove, and the square clamping block is slidably connected to the inner wall of the vertical connecting frame. When the square clamping block moves the main component downwards to splice with accessories, the force applied to the square clamping block will cause the main component to move upwards, thereby providing a certain force relief and buffering effect. This prevents the splicing of the main component and accessories from being too rigid at the connection point during splicing, which could lead to material damage.

Description

Technical Field

[0001] This invention belongs to the field of automated production of charger bottom shells, specifically relating to an automated production device for mobile phone charger bottom shells. Background Technology

[0002] Currently, the production of mobile phone charger bottom shells is mostly carried out manually or semi-automatically, which suffers from problems such as low production efficiency, unstable product quality, poor product consistency, and high labor intensity for workers. With the continued growth in market demand for chargers, traditional production methods are no longer sufficient to meet the needs of large-scale production. Therefore, there is an urgent need to develop an automated production device for mobile phone charger bottom shells that integrates feeding, molding, cooling, and transportation to achieve automated mass production.

[0003] Patent CN206493608U relates to the field of mobile phone charger production technology and equipment, specifically an automatic production device for mobile phone charger bottom shells. This utility model includes an injection molding machine, a robotic arm, an automatic feeder, and a conveyor. The robotic arm includes a transmission mechanism and a loading / unloading clamping mechanism. The loading / unloading clamping mechanism includes a robotic arm and a clamping main board. The suction device includes a jig plate and a suction cup base, with suction cups mounted on the suction cup base. In this patent, the automatic feeder automatically provides hardware products. The loading / unloading clamping mechanism moves under the drive of the transmission mechanism, clamping the hardware products from the automatic feeder. The hardware products are then inserted into the mobile phone charger bottom shell inside the injection molding machine. The loading / unloading clamping mechanism flips, and the suction device picks up the mobile phone charger bottom shell with the hardware products installed. Driven by the transmission mechanism, the device moves the shell to the conveyor, transporting the produced mobile phone charger bottom shell out.

[0004] The above-mentioned device also has the following problems: Although the device solves the problems mentioned above, it is still difficult to assemble the multi-layer bottom shell during use. In the prior art, the multi-layer bottom shell is generally assembled by stacking multiple times, but the rigidity of the splice is too high during the assembly process, which leads to material damage during the splicing. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic production device for the bottom shell of a mobile phone charger, so as to solve the problem of material damage caused by excessive rigidity at the splicing point during the assembly process.

[0006] To achieve the above objectives, the present invention provides an automatic production device for the bottom shell of a mobile phone charger, including a frame shell, a retention splicing frame provided on the top of the frame shell, a micro-adjustment mechanism provided on the top of the frame shell, a collection chamber mechanism provided on the side wall of the frame shell, a screw rod rotatably connected to the bottom of the frame shell, a motor provided on the left side of the screw rod, and the screw rod being fixedly connected to the output end of the motor. The retaining splicing frame includes a brake lever, a horizontal slide groove frame, an extrusion plate frame, an electric slide groove, a vertical connecting frame, and a square clamping block. The brake lever is movably connected to the outer circumferential surface of the spiral rod. The inner wall of the brake lever is provided with a movable key, which is located in the spiral groove on the outer circumferential surface of the spiral rod. The horizontal slide groove frame is fixedly connected to the top of the brake lever. The extrusion plate frame is slidably connected to the outer wall of the horizontal slide groove frame. The electric slide groove is fixedly connected to the outer wall of the extrusion plate frame. The vertical connecting frame is slidably connected to the inner wall of the electric slide groove. The square clamping block is slidably connected to the inner wall of the vertical connecting frame. The square clamping block and the inner wall of the vertical connecting frame are connected by a spring.

[0007] According to another advantageous design of the present invention, the retaining splicing frame further includes a sliding vertical bar, a fixed connecting plate, and a horizontal sliding groove. The sliding vertical bar is slidably connected to the outer wall of the square clamping block, the fixed connecting plate is fixedly connected to the top of the extrusion sheet frame, and the horizontal sliding groove is formed on the inner wall of the fixed connecting plate. The sliding vertical bar and the horizontal sliding groove are slidably connected.

[0008] According to another advantageous design of the present invention, the retaining splicing frame further includes a linkage frame plate and a clamping cotton plate, wherein the linkage frame plate is slidably connected to the inner wall of the frame housing, the clamping cotton plate is fixedly connected to the inner wall of the linkage frame plate, and the sliding vertical bar is slidably connected to the linkage frame plate. When the square clamping block moves the main component downwards to assemble with the accessories, the force applied to the square clamping block will cause the main component to move upwards, thus playing a certain role in relieving stress and buffering, preventing the connection between the main component and the accessories from being too rigid during the assembly process, which could lead to material damage.

[0009] According to another advantageous design of the present invention, the micro-adjustment mechanism includes a bottom drive vertical frame and a horizontal slide plate, wherein the bottom drive vertical frame is fixedly connected to the outer wall of the fixed connecting plate, and the horizontal slide plate is fixedly connected to the inner wall of the bottom drive vertical frame.

[0010] According to another advantageous design of the present invention, the micro-adjustment mechanism includes an inclined clamping plate and a fixed bending frame, wherein the inclined clamping plate is fixedly connected to the bottom of the transverse sliding frame plate, and the fixed bending frame is fixedly connected to the inner wall of the linkage frame plate.

[0011] According to another advantageous design of the present invention, the micro-adjustment mechanism further includes a visual detector and a sliding limiting groove. The visual detector is fixedly connected to the top of the fixed bending frame, and the sliding limiting groove is opened on the top of the frame housing. The linkage frame plate is slidably connected to the sliding limiting groove, and the sliding limiting groove is used to limit the linkage frame plate. When the square clamping block moves the main component downwards to assemble with the accessories, the force applied to the square clamping block will cause the main component to move upwards, thus playing a certain role in relieving stress and buffering, preventing the connection between the main component and the accessories from being too rigid during the assembly process, which could lead to material damage.

[0012] According to another advantageous design of the invention, the collection chamber mechanism includes a receiving chamber and a sliding ramp, the receiving chamber being fixedly connected to the outer wall of the frame housing, and the sliding ramp being formed on the inner wall of the frame housing.

[0013] According to another advantageous design of the present invention, the collection compartment mechanism further includes horizontal and vertical frames and frame connecting bars, the horizontal and vertical frames being fixedly connected to the outer wall of the linkage frame plate, the frame connecting bars being fixedly connected to the bottom of the horizontal and vertical frames, and the frame connecting bars being slidably connected to the collection compartment.

[0014] According to another advantageous design of the invention, the collection chamber mechanism further includes a flexible rod, which is fixedly connected to the top of the frame connecting bar, and the flexible rod has a certain degree of elasticity; As the horizontal sliding frame moves downward, it drives the inclined clamping plate downward. During the downward movement of the inclined clamping plate, the bottom inclined surface of the inclined clamping plate presses and moves the bottom accessory, so that it moves to the correct position to prevent the mounting holes of the main component and the accessory from being misaligned, which would lead to splicing failure.

[0015] The beneficial effects of this invention are: 1. In this invention, with the cooperation of the horizontal sliding groove frame, the extrusion plate frame, the linkage frame plate, and the clamping cotton plate, the horizontal sliding groove frame moves during the movement, driving the extrusion plate frame to move. When the extrusion plate frame moves the main component in the square clamping block to the top of the accessory, the extrusion plate frame moves downward to drive the main component and the accessory to fit and splice. Since the outer wall of the linkage frame plate is provided with multiple clamping cotton plates, multiple accessories can be fixed at the same time according to the assembly steps, thereby improving the assembly efficiency of the device for the charger bottom shell, and adapting to the splicing of multi-layer charger bottom shells. When the square clamping block moves the main component downwards to assemble with the accessories, the force applied to the square clamping block will cause the main component to move upwards, thus playing a certain role in relieving stress and buffering, preventing the connection between the main component and the accessories from being too rigid during the assembly process, which could lead to material damage.

[0016] 2. In this invention, with the cooperation of the square clamping block, the vision detector, and the horizontal sliding frame, the square clamping block will temporarily stay on top of the vision detector during the process of moving the main component. Then, the vision detector will start to take pictures and detect the main component held by the square clamping block, thereby screening out unqualified main components and avoiding unqualified main components from damaging the subsequent intact parts during the subsequent splicing process. As the bottom drive vertical frame moves downward, it drives the horizontal slide plate downward. As the horizontal slide plate moves downward, it drives the inclined clamping plate downward. As the inclined clamping plate moves downward, it presses the bottom accessory with the inclined surface at the bottom of the inclined clamping plate to move it to the correct position, preventing the main component and accessory mounting holes from misaligning and causing splicing failure.

[0017] 3. In this invention, with the cooperation of the flexible rod, horizontal and vertical frames, and connecting strips, when the charger bottom shell enters the inner wall of the flexible rod, the linkage plate moves, causing the horizontal and vertical frames to move. During the movement of the horizontal and vertical frames, the connecting strips move, causing the top flexible rod to move. This movement pushes the charger bottom shell that is stuck at the top of the flexible rod downwards, preventing the next batch of assembled charger bottom shells from colliding with the previous batch and causing damage to the charger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the retention splicing frame structure of the present invention; Figure 3 This is the invention Figure 2 Enlarged view of a portion of the structure at point A; Figure 4 This is a schematic diagram of the fixed bending frame structure of the present invention; Figure 5 This is the invention Figure 4 A magnified view of the structure at point B in the diagram; Figure 6 This is a schematic diagram of the storage compartment structure of the present invention; Figure 7 This is the invention Figure 6 A magnified view of the structure at point C.

[0019] The markings in the diagram are as follows: 1. Frame housing; 2. Retention splicing frame; 201. Brake lever; 202. Horizontal slide rail frame; 203. Extrusion plate frame; 204. Electric slide rail; 205. Vertical connecting frame; 206. Square clamping block; 207. Sliding vertical bar; 208. Fixed connecting plate; 209. Horizontal slide rail; 210. Linkage frame plate; 211. Clamping cotton plate; 3. Micro-adjustment mechanism; 301. Bottom drive vertical frame; 302. Horizontal slide rail plate; 303. Inclined clamping plate; 304. Fixed bending frame; 305. Vision detector; 306. Sliding limiting groove; 4. Collection chamber mechanism; 401. Collection chamber; 402. Sliding ramp; 403. Horizontal and vertical frames; 404. Frame connecting bar; 405. Soft placement rod; 5. Helical rod. Detailed Implementation

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0021] like Figures 1-7 As shown, one embodiment of the present invention is an automatic production device for the bottom shell of a mobile phone charger, including a frame shell 1, a retention splicing frame 2 provided on the top of the frame shell 1, a micro-adjustment mechanism 3 provided on the top of the frame shell 1, a collection chamber mechanism 4 provided on the side wall of the frame shell 1, a screw rod 5 rotatably connected to the bottom of the frame shell 1, a motor provided on the left side of the screw rod 5, and the screw rod 5 is fixedly connected to the output end of the motor. The retaining splicing frame 2 includes a brake pad 201, a horizontal slide rail frame 202, an extrusion plate frame 203, an electric slide rail 204, a vertical connecting frame 205, and a square clamping block 206. The brake pad 201 is movably connected to the outer circumferential surface of the spiral rod 5. The inner wall of the brake pad 201 is provided with a movable key, which is located in the spiral groove on the outer circumferential surface of the spiral rod 5. The horizontal slide rail frame 202 is fixedly connected to the top of the brake pad 201. The extrusion plate frame 203 is slidably connected to the outer wall of the horizontal slide rail frame 202. The electric slide rail 204 is fixedly connected to the outer wall of the extrusion plate frame 203. The vertical connecting frame 205 is slidably connected to the inner wall of the electric slide rail 204. The square clamping block 206 is slidably connected to the inner wall of the vertical connecting frame 205. The square clamping block 206 and the inner wall of the vertical connecting frame 205 are connected by a spring.

[0022] The retention splicing frame 2 also includes a sliding vertical bar 207, a fixed connecting plate 208, and a horizontal sliding groove 209. The sliding vertical bar 207 is slidably connected to the outer wall of the square clamping block 206, the fixed connecting plate 208 is fixedly connected to the top of the extrusion sheet frame 203, and the horizontal sliding groove 209 is opened on the inner wall of the fixed connecting plate 208. The sliding vertical bar 207 and the horizontal sliding groove 209 are slidably connected.

[0023] The retention splicing frame 2 also includes a linkage frame plate 210 and a clamping cotton plate 211. The linkage frame plate 210 is slidably connected to the inner wall of the frame housing 1, and the clamping cotton plate 211 is fixedly connected to the inner wall of the linkage frame plate 210. The sliding vertical bar 207 is slidably connected to the linkage frame plate 210. When the square clamp 206 moves the main component downwards to splice with the accessories, the square clamp 206 will be subjected to force and move the main component upwards, thereby playing a certain role in unloading and buffering, preventing the splicing of the main component and accessories from being too rigid at the connection point, which could cause material damage during splicing.

[0024] The micro-adjustment mechanism 3 includes a bottom drive vertical frame 301 and a horizontal slide plate 302. The bottom drive vertical frame 301 is fixedly connected to the outer wall of the fixed connecting plate 208, and the horizontal slide plate 302 is fixedly connected to the inner wall of the bottom drive vertical frame 301.

[0025] The micro-adjustment mechanism 3 includes a slanted clamping plate 303 and a fixed bending frame 304. The slanted clamping plate 303 is fixedly connected to the bottom of the horizontal sliding frame plate 302, and the fixed bending frame 304 is fixedly connected to the inner wall of the linkage frame plate 210.

[0026] The micro-adjustment mechanism 3 also includes a vision detector 305 and a sliding limit groove 306. The vision detector 305 is fixedly connected to the top of the fixed bending frame 304, and the sliding limit groove 306 is opened on the top of the frame housing 1. The linkage frame plate 210 is slidably connected to the sliding limit groove 306, and the sliding limit groove 306 is used to limit the linkage frame plate 210. As the horizontal sliding frame 302 moves downward, it drives the inclined fixing plate 303 to move downward. During the downward movement of the inclined fixing plate 303, the inclined surface at the bottom of the inclined fixing plate 303 presses and moves the bottom accessory, so that it moves to the correct position to prevent the mounting holes of the main component and the accessory from being misaligned, which would lead to splicing failure.

[0027] Working Principle: This device is mainly used for assembling the charging base. During operation, the main component is first placed between the square clamping blocks 206. Then, the electric slide 204 is activated, driving the vertical connecting frame 205 to move. During this movement, the vertical connecting frame 205 moves the square clamping blocks 206, clamping and constraining the main charger component. Next, the accessory to be joined with the main component is placed between the clamping cotton plate 211. During the movement of the vertical connecting frame 205, the sliding vertical bar 207 moves under the limit of the horizontal slide 209. During this movement, the sliding vertical bar 207 drives the linkage plate 210 to converge towards the center, subsequently centering the accessory on the clamping cotton plate 211. Then, the spiral rod 5 rotates, driving the brake pad 201 to move. The brake pad 201 moves... During the process, the top horizontal sliding groove frame 202 is moved, which in turn moves the extrusion plate frame 203. When the extrusion plate frame 203 moves the main component in the square clamping block 206 to the top of the accessory, the extrusion plate frame 203 moves downward to make the main component and the accessory fit together. Since the outer wall of the linkage plate 210 is provided with multiple clamping cotton plates 211, multiple accessories can be fixed at the same time according to the assembly steps, thereby improving the assembly efficiency of the device for the charger bottom shell. At the same time, it is suitable for splicing the charger bottom shell with a multi-layer structure. When the square clamping block 206 moves the main component downward to splice with the accessory, the square clamping block 206 will be forced to move the main component upward, thereby playing a certain role in unloading and buffering, preventing the splicing of the main component and the accessory from being too rigid at the connection point during the splicing process, which would cause material damage during the splicing.

[0028] During the movement of the main component, the square clamping block 206 will temporarily remain on top of the vision detector 305. Subsequently, the vision detector 305 will start to capture and inspect the main component held by the square clamping block 206, thereby screening out unqualified main components to prevent unqualified main components from damaging subsequent intact accessories during the subsequent splicing process. During the downward movement of the fixed connecting plate 208, the bottom drive vertical frame 301 will move. During the downward movement of the bottom drive vertical frame 301, the horizontal sliding frame 302 will move downward. During the downward movement of the horizontal sliding frame 302, the inclined fixing plate 303 will move downward. During the downward movement of the inclined fixing plate 303, the inclined surface at the bottom of the inclined fixing plate 303 will press and move the accessory at the bottom, so that it moves to the correct position to prevent the mounting holes of the main component and the accessory from being misaligned, which would lead to splicing failure.

[0029] like Figures 1-7 As shown, based on the above embodiment, the collection chamber mechanism 4 includes a collection chamber 401 and a sliding ramp 402. The collection chamber 401 is fixedly connected to the outer wall of the frame housing 1, and the sliding ramp 402 is opened on the inner wall of the frame housing 1.

[0030] The collection chamber mechanism 4 also includes horizontal and vertical frames 403 and frame connecting bars 404. The horizontal and vertical frames 403 are fixedly connected to the outer wall of the linkage frame plate 210, and the frame connecting bars 404 are fixedly connected to the bottom of the horizontal and vertical frames 403. The frame connecting bars 404 are slidably connected to the collection chamber 401.

[0031] The collection chamber mechanism 4 also includes a flexible rod 405, which is fixedly connected to the top of the frame connecting bar 404 and has a certain degree of elasticity. During the movement of the connecting rod 404, the top flexible rod 405 is moved, which pushes the charger bottom shell stuck on the top of the flexible rod 405 downward to prevent the next batch of assembled charger bottom shells from colliding with the previous batch and causing damage to the charger.

[0032] Working principle: After the bottom shell is assembled, the square clamp 206 releases the assembled charger bottom shell. Then, the charger will fall into the inner wall of the receiving compartment 401 through the guide of the sliding ramp 402. The assembled charger bottom shell will then fall to the top of the flexible rod 405, where it will be elastically cushioned. This step does not require manual removal of parts and also prevents the assembled charger bottom shell from being impacted and causing the assembled charging base to fall apart. When the charger bottom shell enters the inner wall of the flexible rod 405, the linkage plate 210 moves, driving the horizontal and vertical frames 403 to move. During the movement of the horizontal and vertical frames 403, the frame connecting bar 404 moves, which in turn drives the top flexible rod 405 to move, thus pushing the charger bottom shell stuck on the top of the flexible rod 405 downwards, preventing the next batch of assembled charger bottom shells from colliding with the previous batch and causing damage to the charger.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic production device for the bottom shell of a mobile phone charger, characterized in that, The frame includes a housing (1), a retaining splicing frame (2) is provided on the top of the housing (1), a micro-adjustment mechanism (3) is provided on the top of the housing (1), a collection chamber mechanism (4) is provided on the side wall of the housing (1), and a screw rod (5) is rotatably connected to the bottom of the housing (1). A motor is provided on the left side of the screw rod (5), and the screw rod (5) is fixedly connected to the output end of the motor. The retaining splicing frame (2) includes a brake lever (201), a horizontal slide groove frame (202), an extrusion plate frame (203), an electric slide groove (204), a vertical connecting frame (205), and a square clamping block (206). The brake lever (201) is movably connected to the outer circumferential surface of the spiral rod (5). The inner wall of the brake lever (201) is provided with a movable key, and the movable key is located in the spiral groove on the outer circumferential surface of the spiral rod (5). The horizontal slide groove frame (202) is fixedly connected to the brake lever (204). At the top of the moving rod (201), the extrusion plate frame (203) is slidably connected to the outer wall of the horizontal slide groove frame (202), the electric slide groove (204) is fixedly connected to the outer wall of the extrusion plate frame (203), the vertical connecting frame (205) is slidably connected to the inner wall of the electric slide groove (204), the square clamp (206) is slidably connected to the inner wall of the vertical connecting frame (205), and the square clamp (206) and the inner wall of the vertical connecting frame (205) are connected by a spring.

2. The automatic production device for the bottom shell of a mobile phone charger according to claim 1, characterized in that, The retention splicing frame (2) also includes a sliding vertical bar (207), a fixed connecting plate (208), and a horizontal sliding groove (209). The sliding vertical bar (207) is slidably connected to the outer wall of the square clamp (206). The fixed connecting plate (208) is fixedly connected to the top of the extrusion sheet frame (203). The horizontal sliding groove (209) is opened on the inner wall of the fixed connecting plate (208). The sliding vertical bar (207) and the horizontal sliding groove (209) are slidably connected.

3. The automatic production device for the bottom shell of a mobile phone charger according to claim 2, characterized in that, The retaining splicing frame (2) also includes a linkage frame plate (210) and a clamping cotton plate (211). The linkage frame plate (210) is slidably connected to the inner wall of the frame housing (1), and the clamping cotton plate (211) is fixedly connected to the inner wall of the linkage frame plate (210). The sliding vertical bar (207) is slidably connected to the linkage frame plate (210).

4. The automatic production device for the bottom shell of a mobile phone charger according to claim 3, characterized in that, The micro-adjustment mechanism (3) includes a bottom drive vertical frame (301) and a horizontal slide plate (302). The bottom drive vertical frame (301) is fixedly connected to the outer wall of the fixed connecting plate (208), and the horizontal slide plate (302) is fixedly connected to the inner wall of the bottom drive vertical frame (301).

5. An automatic production device for the bottom shell of a mobile phone charger according to claim 4, characterized in that, The micro-adjustment mechanism (3) includes a slanted clamping plate (303) and a fixed bending frame (304). The slanted clamping plate (303) is fixedly connected to the bottom of the horizontal sliding frame plate (302), and the fixed bending frame (304) is fixedly connected to the inner wall of the linkage frame plate (210).

6. An automatic production device for the bottom shell of a mobile phone charger according to claim 5, characterized in that, The micro-adjustment mechanism (3) also includes a visual detector (305) and a sliding limiting groove (306). The visual detector (305) is fixedly connected to the top of the fixed bending frame (304). The sliding limiting groove (306) is opened on the top of the frame housing (1). The linkage frame plate (210) is slidably connected to the sliding limiting groove (306). The sliding limiting groove (306) is used to limit the linkage frame plate (210).

7. An automatic production device for the bottom shell of a mobile phone charger according to claim 6, characterized in that, The collection chamber mechanism (4) includes a collection chamber (401) and a sliding ramp (402). The collection chamber (401) is fixedly connected to the outer wall of the frame housing (1), and the sliding ramp (402) is opened on the inner wall of the frame housing (1).

8. An automatic production device for the bottom shell of a mobile phone charger according to claim 7, characterized in that, The collection chamber mechanism (4) also includes a horizontal and vertical frame (403) and a frame connecting bar (404). The horizontal and vertical frame (403) is fixedly connected to the outer wall of the linkage plate (210), and the frame connecting bar (404) is fixedly connected to the bottom of the horizontal and vertical frame (403). The frame connecting bar (404) is slidably connected to the collection chamber (401).

9. An automatic production device for the bottom shell of a mobile phone charger according to claim 8, characterized in that, The collection chamber mechanism (4) also includes a flexible rod (405), which is fixedly connected to the top of the frame connecting bar (404) and has a certain degree of elasticity.

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